Voltage regulating amplifier system



Oct. f2, 1948.

R. J. DETUNO VOLTAGE REGULATING AMPLIFIER SYSTEM Filed June 27, 1944 NVEN 70/? EJ Dara/v0 5V 4/1417 ATTORNEY Patented on. 12, 1948 I VOLTAGEREGULA'IING AMPLIFIER srs'rrm Rocco J. Detuno. Chicago, 111., assignorto Western Electric Company, Incorporated, New York,

' N. Y., a corporation of New York Application June 21, 1944, Serial No.542,416

11 Claims. 1

voltage to change due to the varying energy losses in the generator andamplifier circuits.

An object of the present invention is to provide a generator oramplifier having a high degree of voltage regulation.

In accordance with one embodiment of the invention an oscillationgenerator and amplifier is provided in which a portion of the outputcurrent is rectified and utilized to reduce a constant positivepotential tending to be applied to the regu- 1 lating grid of athermionic tube in an oscillator circuit.

A complete understanding of the invention will be had by reference tothe following description taken in conjunction with" the accompanyingdrawing in which the single figure i a circuit diagram of an apparatusembodying the inventio'n.

Referring to the drawings, a pentode oscillator tube 6 is shown having acontrol grid 1, a screen or regulator grid 8, a suppressor grid 9, ananode I and an indirectly heated cathode l I. The input circuit of theoscillator tube comprises a conventional circuit consisting of pairs ofcondensers and resistances l2 and l3, l4 and l5, l6 and I1,

each of which displaces the phase of the current from the anode circuitby 60 so that the voltage applied to the control grid 1 will besubstantially- 180 out of phase with the voltage of the anode l0.

A suitable potential may be applied to the anode by means of a directcurrent source it! through a resistor iii. The direct current source I8is also 1 connected to ground through a pairof series connectedthermionic regulator tubes 2| and 22 which tend to maintain thepotential applied to the anode l0 substantially constant.

The output of the oscillator circuit is connected to an amplifiercircuit 23 through a condenser 24 and variable resistance 20. Inaddition, two or more push-pull amplifier circuits 25 and 26 may beemployed, the output of the last amplifier circuit being connected tooutput terminals 21 through a transformer 28.

In order to control the voltage applied to the output terminals 9,potentiometer resistance 29 is connected across the secondary circuit ofthe transformer 28. The potentiometer 29 is used to feed a rectifier 30connected thereto through a transformer 3|. The rectifier circuitincludes a filter circuit 32 and an output resistance 83, the

positive end of resistance 38 .being connected to a point between thevoltage regulator tubes 2| and 22 and the negative side of theresistance is connected to the regulator grid. 8 of the oscillator tube6. In this manner it will be seen that through the operation of thevoltage regulator tube 22 there will be a tendency for a constantpositive voltage to be applied to the regulator grid of the oscillatortube. From this positive voltage, however, there will be subtracted (oralgebraically added) the negativ voltage existing across the resistor33. Thus, for instance. if the load current taken from the outputterminals tends to increase, there will 'be tendency for the secondaryvoltage of the transformer 28 to drop. This will result in a decreasedvoltage being applied to the rectifier tube and a decrease in thnegative voltage across the'resistor 33, whereby the positive voltage ofthe regulator grid 8 will be increased, tending to increase the outputvoltage of the transformer 28. Conversely, when the load current takenfrom the output terminals is decreased, the secondary voltage of thetransformer 28 will tend to increase, producing an increased negativevoltage across the resistance 83, resulting in a decrease of thepositive voltage tending to be applied to the regulator grid 8. By thuscompensating for the tendency of the output voltage to vary, a highvoltage regulation may be obtained without materially varying thefrequency of the output.

What is claimed is:

- 1. An amplifier system comprising a circuit including a thermionictube having an anode, a cathode, an input grid, a screen grid and ananode output circuit, an amplifier connected to said anode outputcircuit, said amplifier having an out-' put load circuit including anoutput transformer with a primary winding and a secondary winding, Y

. means for rectifying a portion of the output current in said secondarywinding to provide a regulating potential inversely proportional tosaid'current. means tending to maintain a constant higher thanrequiredpositive potential on said screen grid, and means for applyingsaid regulating potential to said screen grid thereby subtracting saidregulating potential from the positive poten. tial tending to be appliedto said screen grid.

2. A current generator comprising an oscillator circuit including athermionic tube having an anode, a cathode, an input grid, a screen gridand an anode output circuit, an amplifier connected to said anode outputcircuit for amplifying the output of said oscillator circuit, saidamplifier having an output load circuit, means for rectify- 65 ing aportion of the output current of said load circuit to provide aregulating potential inversely proportional to said current, a regulatortube, means for applying a direct current potential to said regulatortube, and means for applying the differential potential of saidrectified current potential and the potential on said regulator tube tosaid screen grid.

3. An amplifier system having an output circuit connectable to anexternal load, said system comprising a circuit including a thermionictube having an anode, a cathode, an input grid and a regulating grid,means including a voltage regulator for applying a constant potential tosaid anode, mean including a constant voltage regulator tending to applya constant positive potential to said regulating grid, and meansconnected to said output circuit and responsive to variations intheexternal load for modifyi g the potential applied to said regulatinggrid by a modifying potential obtained from the output circuit of saidsystem,

said modifying potential being inversely proportional to the outputcurrent of said system.

4. An amplifier system having an output circuit connectable to anexternal load, said system comprising a circuit including a thermionictube having an anode, a cathode, an input grid and a regulating grid,means including a constant voltage regulator tending to apply a constantpositive potential to said regulating grid, and means responsive tocurrent variations in the external load for modifying the potentialapplied to said regulating grid by a modifying potential obtained fromsaid output circuit, said modifying potential being inverselyproportional to the output current of said system.

5. An amplifier system having an output load circuit connectable to anexternal load, said system comprising a circuit including a thermionictube having an anode, a cathode, an input grid,

and a regulating grid, means tending to apply a constant higher thanrequired positive potential to said regulating grid, and means connectedto said output circuit and responsive to fluctuating external loadconditions for adding a negative potential inversely proportional to theoutput current of said system to said positive potential at saidregulating grid.

6. An electronic generator comprising an oscillator circuit including athermionic tube having an anode, a cathode, an input grid, a regulatinggrid, and an anode output circuit connectable to an external load, apair of series connected constant voltage regulator tubes for applying aconstant potential to said anode, means utilizing one of said regulatortubes tending to apply a constant positive potential to said regulatinggrid,

and means coupled to said anode output circuit and responsive tofluctuations of the external load for adding a negative potentialinversely proportional to the output current of said system to thepositive potential tending to be applied to said regulating grid.

7. An electronic generator comprising an oscillator circuit including athermionic tube having an anode, a cathode, an input grid and aregulating grid, a pair of series connected constant voltage regulatortubes for applying a constant potential to said anode, means utilizingone or said regulator tubes tending to apply a constant positivepotential to said regulating grid, means for rectifying a portion of theoutput current of said generator to provide a regulating potentialinversely proportional to said current, and means for modifying thepotential tending to be applied to said regulating grid by saidregulating potent al.

8. An electronic generator comprising an oscillator circuitJnciuding athermionic tube having an anode, a cathode, an input grid and aregulating grid, a pair of serially connected constant voltage regulatortubes for applying a constant potential to said anode, one of saidregulator tubes tending to apply a constant potential to said regulatinggrid, a rectifier circuit, including a rectifier and an outputresistance, means for applying a potential inversely proportional to theoutput current of said generator to said rectifier, the positive outputside of said rectifier being connected to said serial connection betweensaid regulator tubes and to one end of said output resistance, thenegative output side of said rectifier being connected to the oppositend of said resistance and to said regulating grid whereby the potentialdrop through said resistance is deducted from the potential tending tobe applied to said control grid.

9. An amplifier system including a thermionic tube having an anode, acathode, an input grid and a screen grid adapted to operate at apositive potential, an amplifier coupled to said tube for amplifying theanode output of said tube, said amplifier having an output circuit,means for rectifying a portion of the current in said amplifier outputcircuit inversely proportional to the current in said output circuit toprovide a regulating potential, means tending to maintain a higherthan-required potential on said screen grid, and means for applying saidregulating potential to said screen grid thereby to subtract saidregulating potential from the potential tending to be applied to saidscreen grid.

10. An amplifier system comprising a thermionic tube having an anode, acathode, an input grid and a regulator grid, means tending to apply aconstant potential to said regulator grid, a thermionic amplifierassociated with said tube, said amplifier having an output circuit, andmeans for adding a negative potential inversely proportional to thecurrent in said output circuit to the positive potential tending tobeapplied to said regulating grid.

11. An electronic generator having an output circuit connectable to anexternal load, said generator comprising a thermionic tube having ananode, a cathode, an input grid and a screen grid, means tending toapply a constant positive potential to said screen grid, and means foradding to ,said positive potential at the screen grid a negativepotential inversely proportional to the output current of said system,said last means being coupled to the output circuit and responsive tocurrent fluctuation in the output circuit-due to variations in theexternal load.

ROCCO J. DETUNO.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,264,369 Golicke Dec. 2, 19412,292,439 Golicke Aug. 11, 1942 2,323,192 Blair June 29, 1943 2,369,953Downey Feb. 20, 1945

